§ 140.150 RSMo — Lands, lots, mineral rights, and royalty interests subject to sale, when

1. All lands, lots, mineral rights, and royalty interests on which taxes or special assessments are delinquent and unpaid are subject to sale to discharge the lien for the delinquent and unpaid taxes or unpaid special assessments as provided for in this chapter on the fourth Monday in August of each year.

2. No real property, lots, mineral rights, or royalty interests shall be sold for state, county or city taxes or special assessments without judicial proceedings, unless the notice of sale contains the names of all record owners thereof, or the names of all owners appearing on the land tax book and all other information required by law. Delinquent taxes or unpaid special assessments, penalty, interest and costs due thereon may be paid to the county collector at any time before the property is sold therefor. The collector shall send notices to the publicly recorded owner of record before any delinquent and unpaid taxes or unpaid special assessments as specified in this section subject to sale are published. The first notice shall be by first class mail. A second notice shall be sent by certified mail only if the assessed valuation of the property is greater than one thousand dollars. If the assessed valuation of the property is not greater than one thousand dollars, only the first notice shall be required. If any second notice sent by certified mail under this section is returned to the collector unsigned, then notice shall be sent before the sale by first class mail to both the owner of record and the occupant of the real property. The postage for the mailing of the notices shall be paid out of the county treasury, and such costs shall be added to the costs of conducting the sale, and the county treasury shall be reimbursed to the extent that such postage costs are recovered at the sale. The failure of the taxpayer or the publicly recorded owner to receive the notice provided for in this section shall not relieve the taxpayer or publicly recorded owner of any tax liability imposed by law.

3. The entry in the back tax book by the county clerk of the delinquent lands, lots, mineral rights, and royalty interests constitutes a levy upon the delinquent lands, lots, mineral rights, and royalty interests for the purpose of enforcing the lien of delinquent and unpaid taxes or unpaid special assessments, together with penalty, interest and costs.